LINE Messaging API

This connector uses the LINE Messaging API v2.

Creating a channel: log in to https://developers.line.biz/console → create a Provider → 'Create a new channel' → 'Messaging API'. Set up the LINE Official Account (auto-created with the channel), then under the channel's 'Messaging API' tab, scroll to 'Channel access token' → 'Issue' a long-lived token. Paste it as LINE_CHANNEL_ACCESS_TOKEN.

Authentication: Bearer Token (the channel access token). Note: this token belongs to the channel, not to a user — anyone with the token can post as that Official Account, so keep it secret.

Message shape: LINE messages are objects with a type field. Simplest example: {"type": "text", "text": "Hello"}. Other types: sticker, image, video, audio, location, template, flex. The messages parameter on every tool is an array of up to 5 message objects.

to userId: a userId is U followed by 32 hex characters. It comes from a webhook event (this connector does not receive webhooks, so the user has to give it to you) or, on verified and premium accounts, from line_list_follower_ids. A display name is not a userId, and a made-up one fails with "The value for the 'userId' parameter is invalid".

replyToken: returned in webhook events, single-use, valid for about a minute after the user's message. Never call line_reply_message with a placeholder: LINE answers "Invalid reply token". Without a fresh token, push instead. Use line_reply_message (free, unlimited) instead of line_push_message (counts against the monthly quota) whenever possible.

Broadcast: sends to ALL friends of the Official Account. Counts heavily against the push quota — use sparingly.

Pricing: the free plan includes a monthly number of push and broadcast messages that depends on the country (for example 200 in Japan); paid plans raise it. line_get_message_quota returns the account's own limit.

Before sending: line_get_bot_info checks the token, line_get_message_quota and line_get_message_quota_consumption show how much of the monthly push quota is left. Push and broadcast reach real people: show the message and the recipient and wait for the user's yes.